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Session 04C: Collection, Pump Stations and Conveyance: Pump Stations
3:00pm - 5:15pm
Session Chair: Jason Morse, Whitney Equipment;
3:00pm - 3:45pm
Modernizing a Remote Water Resource Recovery Facility in the Hoodland Area
Adam Crafts1, Jeff Stallard2
1Murraysmith, United States of America; 2Clackamas County Water Environment Services; ,
Water Environment Services of Clackamas County (WES) owns and operates the Hoodland Water Resource Recovery Facility in Welches, Oregon. This facility, nestled in the foothills of Mt. Hood, treats wastewater from residential communities of Brightwood, Timberline Rim, and Welches and discharges to the Sandy River.
Constructed in 1981, the two-MGD facility has been well maintained and has consistently met its discharge permit limits. However, the facility was aging and demanding more operations and maintenance resources to remain a reliable asset. Further, its remote location and limited monitoring capabilities translates into longer response times with increasing labor costs. Finally, capacity improvements to the influent pump station were needed to convey projected flows and better flow control was desired to for consistent flows at the plant.
WES identified condition and capacity-based improvements to modernize this facility and increase reliability to better align with having the facility only staffed part time. These include a complete overhaul of the influent pump station, replacement of the WRRF motor-control center and emergency power supply. WES also wanted to extend its SCADA network to expand its ability to monitor and control this facility from its operations center which is 60 minutes away.
This presentation will outline the projects ability to:
Expand the pump station capacity while better matching flow variability both seasonally and diurnally
Develop automated wet well and force main flushing cycles and improved cleaning facilities for the 1300-foot long force main to the WRRF.
Maintain wastewater operations during construction at both the WRRF and the Pump Station during wet weather season.
Complete the project on a tight timeline while setting contract provisions that lend contractor flexibility and accountability
Attendees will gain in sight of the facility operations, design considerations and plan development, construction progress, and lessons learned.
3:45pm - 4:30pm
Necessity is the Mother of Invention: Delivering a Pump Upgrade In 6 Months
Jennifer Elise Murphy1, Joshua James McNamee2,3, Brandon David Moss1, Raynold Stanley Nickel1
In May 2018, the Sandy Drainage Improvement Company’s (SDIC) largest flood protection pump (18,000 gpm), became inoperable after 77 years of use. To protect the drainage basin from flooding during the next rainy season, SDIC needed a replacement pump and support systems designed, advertised, fabricated, and installed by October 2018, all within a limited capital budget. The new equipment needed to:
Operate across a large range of varying static head conditions
Maximize the operating lifespan and rehabilitation ability
Allow for use in a future new pump station with variable speed drives
Increase the pumped flow capacity
To meet the aggressive schedule, the SDIC-Parametrix team worked backwards from the end date to establish minimum time periods for each activity. They implemented a unique combination of procurement and construction delivery methods to accelerate the project schedule:
Cost-limited procurements reduced the advertising and ordering timeframes
On-call contractors provided custom pipe fittings and electrical panel modifications
SDIC staff served as the general contractor and provided pump installation
To meet technical requirements, the SDIC-Parametrix team analyzed operational data and maintenance history. This guided selection of appropriate facility-specific technical features and a pump with a unique percentile-optimized operating curve. The team also worked together to balance risks and project priorities leading to choices: for example, providing more comprehensive field testing instead of factory testing ensured on-time equipment delivery.
By working closely together, the SDIC-Parametrix team, designed and installed the pump in time for Portland’s heavy rains. The pump also included client specific features such as:
Heat-cured, fusion-bonded epoxy volute coating to allow for future pump rebuilds in lieu of complete replacements
Inverter-duty motor with shaft grounding rings and insulated upper motor bearings allowing for future use with variable frequency drives
Motor heater to prevent internal condensation when the pump is off for extended periods
4:30pm - 5:15pm
Lessons Learned: Optimizing Alder Pump Station Operation in Portland’s Eastside CSO
Greg Humm1, Aaron Lawler2, Pete Hesford2
1Brown and Caldwell; 2City of Portland, Bureau of Environmental Services; ,
Alder Pump Station, in Portland’s Eastside Combined Sewer Overflow (ESCSO) system, is critical to protecting water quality in the Willamette River. Constructed in 1952 as a caisson with a wetwell and dry pit containing four pumps, it was elevated above the surrounding area to protect against flooding. Alder pump station has been historically undersized, and this project increased capacity of the pump station, and modified the control strategy to better integrate with the ESCSO system. Prior to upgrade, Alder Pump Station was a 4-pump facility: two (2) 750 gpm dry weather pumps and two (2) 1,500 gpm storm pumps. Following completion of the project, it has two, 2,100 gpm sanitary pumps, and two, 1,100 gpm storm pumps.
The pump station uses sanitary pumping capacity, diversion weirs, gravity system storage, and tunnel storage to significantly reduce river discharge frequency and volume. Under normal dry weather operation, the station pumps to the Southeast Interceptor, during wet weather events, the system diverts flow away from the station to reduce discharges to the river. The upgraded Alder Pump Station now pumps excess flow to the river only when the ESCSO Tunnel is full and influent flow continues to exceed capacity of the sanitary pumps. Modeling of the service area demonstrates this condition will only occur four times per winter, meeting NPDES permit requirements.
This project completely reconfigured the station, converting it into a trench style wetwell with submersible pumps. The caisson remained, was seismically stabilized via micropiles, all internal walls were demolished to construct the wetwell. A new building was constructed above the flood plain, allowing vehicle access.
This presentation will give an overview of the ESCSO system, the modeling and design criteria that shaped the pump station upgrade, and give an overview of the lessons learned from the construction challenges.